Every time I play a sound file the computer speakers make a horrible crackly popping sound. The sound also occurs with any movement on the computer (e.g., scrolling with mouse, visualisations on media player). Updating the drivers does not fix the problem. The computer is a brand new P4 2.4 GHz with a GeForce 4 MX 440 and CD-RW & DVD-R running Win XP.

This is certainly not normal and the behaviour you are experiencing indicates that there is some serious interference with your sound card or speakers. On my old computer, it was possible to hear slight interference in the speakers when moving the mouse (which could be attributed to electromagnetic interference) but not to the degree which you are experiencing. You should first check if the problem is the speakers or another source. Plug a set of headphones into your speaker outlet and check if the problem persists. If it does not, you have a speaker problem. This may be due to either interference or faulty hardware. Let’s first try to see if the problem is due to interference. Firstly, make sure that all of your speaker connections/plugs are firmly in the socket. Even if you think they are, check again! When I first received my computer the speakers did not work until I discovered that they were not plugged in firmly enough. Secondly, make sure that your speakers are well away from the monitor and the computer case is well away from the speakers and monitor. Thirdly, make sure that the speaker cables, monitor cables, mouse cables, power cables, etc’¦ are not twisted around each other or are even close together. Some people even wrap aluminium foil around the speaker wires to stop interference, but good quality speakers should have shielded wires. If you still have problems you should take the speakers back to the retailer and ask for them to be tested for faults.

On the other hand, if the problem continues when using headphones, the problem is likely to be related to your sound card. This gets a bit trickier to diagnose and fix. One common suggestion is to move the sound card into a different expansion slot which is as far away from all other cards as possible. This would help reduce any interference and also possibly help fix any hardware addressing conflicts. If you reach this stage, I suggest that you have the problem fixed under the warranty conditions, at an authorised dealer, as attempting any procedures yourself could void your computer’s warranty. So, don’t attempt any procedures yourself, apart from simple diagnostics such as the headphone test.